Piston



April 7, 1925.

-T. A. HUTSELL PISTON Filed Dec. 7, 192;

720/7705 r4. Hm??? (interac v ii atented 7, 1925.

t'iTA'litlSPATENT OFFHCE.

THOMAS A. HUTSELL,

F SPOKANE, 'WASEINGTON, ASSIGDTOE TO HUTSELL MOTOR COMPANY, O F SPOKANE, VJASHINGTON.

PISTON.

Applic tion filed December 7, 1923. Serial No. 679,228.

T 0 all whom it may concern Be it known that I, THOMAS A. HU'rsELL, a citizen of the United States, residing at Spokane, in Spokane County, and State of Washington, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

My present invention relates to improve ments in pistons for internal combustion engines and especially to that type of en-' ally perpendicular to the crank shaft.

' The invention may be said to reside in .the novel construction of the piston in which an annular compression space or chamber is provided in combination with the complementary cylinder; in the arrangement of inlet and outlet ports of the motor piston; and in the special formation of the pump piston in combination with the motor piston.

By these combinations of parts compactly arranged means are provided for compressing and transferring a fuel charge; the walls of the motor piston are cooled from the interior of the piston, and by exchange of heat with the piston walls the fuel mixture or charge is heated as desired and in proportion to the amount of heat generated in the engine due to combustion at any and various loads.

In the accompanying drawings 1 have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and ar ranged in accordance with the best mode I have thus far devised for the practical application of the principles of my invention.

Figure 1 is a View in elevation of a coaxial or tandem piston constructed according to my invention, part being broken away for convenience of illustration.

Figure 2 is a vertical central sectional view at line 22 of Figure 1.

Fi 'ure 3 is an enlarged detail vertical secti nal view at the bottom of the motor piston to disclose the special construction therein. r

The tandem piston is made up of an integral two-part member of which the pump piston 1 is of cylindrical shape open at top and bottom as'seen in Figure 2, and provided with exterior packing rings 2 and 3 of usual or standard type. l/Vithin the pump piston is arranged an annular, intermediate, horizontal flange 4 integral with the piston wall, and beneath the flange the bearing 5 for the piston stem is located, the stem being coupled thereto as usual.

The co-axial motor piston 6 is also of cylindrical construction, rising from theflange 1, but is of reduced diameter and of greater length i ian the pump piston 1.

Between the exterior face of the motor piston and the interior face of the pump piston an annular space or chamber 7 is fashioned in which the fuel charge is compressed by an upward stroke of the pump piston when the engine is operating, and the usual packing rings 8 are carried in the exterior face of the walls of the motor piss ton 6.

A special and meritorious construction is provided for the bottom of the motor piston in the form of a sheet metal disk 9, circular in shape and conforming to the interior of the cylindrical motor piston. The disk is inserted into the lower end of the motor piston and then sprung into place by inserting its edges in an annular groove 10 in the inner face of the piston wall, the groove being beveled slightly on its upper wall to facilitate entrance of the disk edges. The pressure from gases for combustion passing through the motor piston will readily be resisted and their escape prevented by the bottom as thus attached.

At its upper end the motor piston is closed by its integral head 11, and an exterior baflle wall 12 is fashioned on the head for guiding the fresh charge into the combustion chamber and for maintaining the exhaust gases separate from the inlet of fresh fuel.

It will be noted in Figs. 2 and 3 that the bottom 9 of the motor piston is arranged at an angle to the longitudinal axis of the piston and that the bottom declines toward one side of the piston. At this lower side of the bottom and in the extreme lower end of the motor piston wall I arrange a series of vertically extending or longitudinal slots 13 tori'ning intake p rts tor fuel gas as it is compressed in the COmpIG-Sfiiitill chamber 7. A second series of slots lsare provided ii the Wall the motor piston above the inli ports and approiqimately midway the heigh of the motor piston, for use as outlet sorts from which the fuel is conveyed to the combustion chamber of an adjoining cylinder ior ignition.

The charge of gas which is compressed in the chamber 7 on his upstroke oi" the piston is thus forced through the inlet ports 13 to the inte 'ior of the motor piston and the currents striki g the opposite side of the piston ails is deflected upward toware the top or head 11 of the piston providing a turbulent movement of the gas Within the piston. i 'hisci'rcniation of the gas Within the piston permits an exchange of heat from the head and Walls of the piston to the contained gas, resnlting in coolin the piston and heating the fuel gas. The rnel gas thus heated then passes out through the outlet ports 14:, when they register with compiementary ports in the cylinder of the piston (3, and then pass through a passage to ill@ combustion chamber of the adjoining parall l cylinder.

the inclined bottom 9 of the motor piston, as seen in Figures 2 ano 3, at its iowest point, is complementary to the lower Walls of the inlet ports 7, i' will be apparent that any do )OSitS from the interior ot' the piston t3 falling to the bottom 9 Will be in the path of the incoming fuel gas currents. Such deposits Will be picked up and intermingle inel nnntiire, and eventnally pass toward combustion chamber ot the engine; 1 ianner an automatic means is provided L iinig the engine at its start of operin after standing, and this arrangement of the ports with relation to the bottom of the piston prevents flooding at any time,

Having thus fully descriied my invention, What I claim as new and desire to secure by Letters Patent isp The cc-n'ibination with the integral coaxial on np and motor pistons of difierential areas iorming an annular compression chamber, of a closed head for the motor piston, a separate botto for the motor piston and means i SGCH'HDP the bottom in the piston, said motor piston having a lower inlet port from the compression chamber and an upper outlet port.

2. The combination with the co-axial pomp and motor pistons, or" a closed head for the motor piston, said motor piston haw an interior annular grooi'e, and a bottom member said piston seated in said groove.

The combination with the oo-axial pump and motor pistons, ot a closed head h fuel gas, remaining in suspension with for the motor piston, said motor piston having spaced low r inlet ports and upper ontlet ports and a laterally declining annular e'rooi'e in the interiorwall o1 the motor piston, and a bottom member for said piston seated in said groove with its lowe t portion adjacent the inlet ports.

in testimony whereof I ai'lix my signature.

THOMAS A. HUTSELL. 

